The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
How Much Does Mounjaro Cost Per Month in the UK?
Mounjaro costs vary significantly depending on whether you access it through the NHS or private providers. If you're prescribed Mounjaro (tirzepatide) privately in the UK, expect to pay between £129 and £320 per month depending on your dose and provider. NHS costs are free at the point of use, but availability through specialist weight management services is limited and varies considerably by region. Understanding the true cost involves more than just the injection price — consider clinical assessment fees, follow-up consultations, and whether you're eligible for NHS access in your area.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
NHS vs Private Mounjaro Costs
NHS Access: Mounjaro is free on the NHS if prescribed through a specialist tier 3 or 4 weight management service following a clinical assessment. However, NHS availability is extremely limited — many regions have no current Mounjaro access due to cost pressures and long waiting lists. NICE approved tirzepatide (Mounjaro) for specialist weight management services, but implementation varies by Integrated Care Board (ICB). You'll need a referral from your GP to access NHS specialist services, and waiting times can extend many months in some areas.
Private Cost Range: Private prescriptions in the UK typically cost £129–£320 per month depending on dose. Starting doses (2.5 mg) are usually at the lower end (around £129–£180); maintenance doses (10–15 mg) cost more, often £250–£320. The KwikPen contains 4 weekly doses, so monthly costs reflect a four-week supply. Some private providers offer discounts for purchasing multiple months in advance.
- 2.5 mg dose: approximately £130–£160
- 5 mg dose: approximately £160–£200
- 10 mg dose: approximately £240–£280
- 15 mg dose: approximately £280–£320
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
What's Included in the Cost?
When you pay for Mounjaro privately, you're paying for the KwikPen injection itself. Additional costs to consider: an initial clinical assessment by a UK-licensed prescriber (usually £50–£150), follow-up consultations (often included or £30–£80 each), and potential repeat assessment fees. Some private providers bundle these into a monthly package; others charge separately. If you're using MyWeightCheck's free BMI calculator and GLP-1 weight loss calculator to track your progress, you'll have reliable data to share with your prescriber at consultations. Always ask your provider for a complete pricing breakdown before starting treatment — some offer transparent all-inclusive monthly fees while others charge per component.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Is Mounjaro available on the NHS in the UK?
Mounjaro is approved by NICE for NHS specialist weight management services, but availability is extremely limited. Most regions currently have no Mounjaro access due to funding constraints and high demand. Check with your local Integrated Care Board or ask your GP about specialist weight management services in your area — waiting lists are often very long.
Why does Mounjaro cost more at higher doses?
The cost per dose increases because you're receiving a higher amount of tirzepatide in each KwikPen. Higher doses (10–15 mg) represent stronger clinical action and require more active ingredient, so they cost significantly more than starting doses (2.5 mg).
Does private Mounjaro cost include clinical consultations?
This varies by provider. Some include initial assessment and follow-ups in the monthly fee; others charge separately for consultations (typically £30–£150 each). Always ask upfront what's included before paying — transparent providers will give you a complete cost breakdown.
Can I switch from private to NHS Mounjaro if my region approves it?
In theory, yes — you can ask your GP for a referral to specialist NHS services. However, you may not be able to transfer mid-treatment. Discuss timing and continuity of care with both your private provider and your GP before making the switch.
What if I can't afford private Mounjaro?
Explore NHS specialist weight management services (ask your GP for a referral), which are free. Alternatively, discuss alternative options with your GP — other weight loss approaches, lifestyle interventions, or different medications may be suitable and more accessible in your area.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.